全文获取类型
收费全文 | 577篇 |
免费 | 17篇 |
专业分类
各国政治 | 50篇 |
工人农民 | 16篇 |
世界政治 | 78篇 |
外交国际关系 | 30篇 |
法律 | 215篇 |
中国政治 | 3篇 |
政治理论 | 190篇 |
综合类 | 12篇 |
出版年
2021年 | 5篇 |
2019年 | 12篇 |
2018年 | 16篇 |
2017年 | 24篇 |
2016年 | 17篇 |
2015年 | 11篇 |
2014年 | 13篇 |
2013年 | 96篇 |
2012年 | 9篇 |
2011年 | 16篇 |
2010年 | 15篇 |
2009年 | 17篇 |
2008年 | 24篇 |
2007年 | 14篇 |
2006年 | 16篇 |
2005年 | 10篇 |
2004年 | 14篇 |
2003年 | 7篇 |
2002年 | 10篇 |
2001年 | 13篇 |
2000年 | 12篇 |
1999年 | 9篇 |
1998年 | 11篇 |
1997年 | 6篇 |
1996年 | 13篇 |
1995年 | 6篇 |
1994年 | 4篇 |
1993年 | 8篇 |
1992年 | 11篇 |
1991年 | 12篇 |
1990年 | 9篇 |
1989年 | 6篇 |
1988年 | 8篇 |
1987年 | 12篇 |
1986年 | 10篇 |
1985年 | 12篇 |
1984年 | 10篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1977年 | 5篇 |
1976年 | 5篇 |
1975年 | 3篇 |
1973年 | 4篇 |
1972年 | 2篇 |
1969年 | 3篇 |
1967年 | 4篇 |
排序方式: 共有594条查询结果,搜索用时 31 毫秒
581.
582.
583.
584.
The Age Discrimination in Employment Act (ADEA) was amended in 1978 to prohibit mandatory retirement before age 70 in most occupations. The impact of this legislation on the probability of older persons remaining in the labor force is the primary concern of this article. Specifically, questions concerning which older workers are affected by mandatory-retirement provisions and the extent to which they are forced to retire and leave the labor force are examined. Tabular analysis of data from the Retirement History Study on persons aged 62-63 in 1969 shows significant variation in mandatory-retirement coverage between the public and private sectors and across industries, occupations, and demographic groups. Until age 65, the labor-force participation rate of those facing compulsory retirement is higher than or equal to that of those not covered but it drops significantly below the noncovered rate after 65. Logit analysis of the labor-force participation of persons before and after age 65 indicates that mandatory retirement at that age reduces the probability of retirement by approximately 16.7 percentage points for white men wage earners. This results in a decline in the labor-force participation rate of all men aged 66-67 of approximately 4 percentage points. 相似文献
585.
The high-performance liquid chromatographic resolution of the enantiomers of amphetamine, methamphetamine, ephedrine, and pseudoephedrine is described. The sugar isothiocyanate, 2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl isothiocyanate (GITC), is used as a chiral derivatizing agent, with chromatographic separations of the diastereomers formed with each amine made using a standard achiral C18 stationary phase. 相似文献
586.
James Adams Michael Clark Lawrence Ezrow Garrett Glasgow 《American journal of political science》2006,50(3):513-529
Do “niche” parties—such as Communist, Green, and extreme nationalist parties—adjust their policies in response to shifts in public opinion? Would such policy responsiveness enhance these parties' electoral support? We report the results of statistical analyses of the relationship between parties' policy positions, voters' policy preferences, and election outcomes in eight Western European democracies from 1976 to 1998 that suggest that the answer to both questions is no . Specifically, we find no evidence that niche parties responded to shifts in public opinion, while mainstream parties displayed consistent tendencies to respond to public opinion shifts. Furthermore, we find that in situations where niche parties moderated their policy positions they were systematically punished at the polls (a result consistent with the hypothesis that such parties represent extreme or noncentrist ideological clienteles), while mainstream parties did not pay similar electoral penalties. Our findings have important implications for political representation, for spatial models of elections, and for political parties' election strategies. 相似文献
587.
588.
Clark K 《U.S. news & world report》2002,133(20):32-3, 36, 38
589.
Mary A. Clark 《拉美政治与社会》2015,57(4):97-118
After a decade of civil war and four consecutive conservative administrations, El Salvador's leftist FMLN won its first presidential election in 2009. How has public policy changed under this New Left government, and why? This article addresses the question in the area of public health care. An alliance of health sector leaders with both technocratic and diplomatic abilities capitalized on the policy window opened by the FMLN's electoral victory and worked within the parameters set by President Mauricio Funes, the FMLN, and civil society to universalize health care. The new minister of health, a professional highly esteemed inside and outside the country, was able to engage both a large social movement protesting neoliberal policy and an energetic health diplomat sent by the Pan American Health Organization. In designing its reform, this alliance benefited from international as well as “bottom‐up” policy diffusion. 相似文献
590.
Karim M. Abdel‐Hay Ph.D. Jack DeRuiter Ph.D. C. Randall Clark Ph.D. 《Journal of forensic sciences》2015,60(2):285-294
A number of N‐substituted piperazines have been described as drugs of abuse in recent years. This new drug category includes several series of aromatic ring substituted phenylpiperazines. The wide variety of available precursors makes regioisomerism a significant issue in these totally synthetic compounds. In this study, a complete series of regioisomeric dimethoxyphenylpiperazines were synthesized and evaluated using GC‐MS and FT‐IR. The EI mass spectra show fragments characteristic of both the dimethoxyphenyl and the piperazine portions of the molecules including the dimethoxyphenylaziridinium cation (m/z 180) and dimethoxyphenyl cation (m/z 137). The ion at m/z 56 for the C3H6N+ fragment is characteristic of the piperazine ring and was observed in all the spectra. The perfluoroacyl derivatives were resolved by GC, and their mass spectra showed some differences in relative abundance of ions. FTIR provides direct confirmatory data for differentiation between the regioisomeric dimethoxyphenylpiperazines, and GC separation was accomplished on an Rtx‐200 phase. 相似文献